Title :
Single current sensor technique in the DC link of three-phase PWM-VS inverters: a review and a novel solution
Author :
Blaabjerg, Frede ; Pedersen, John K. ; Jaeger, Ulrik ; Thoegersen, Paul
Author_Institution :
Inst. of Energy Technol., Aalborg Univ., Denmark
Abstract :
A review of the existing methods to determine the output currents in a pulsewidth modulation voltage-source (PWM-VS) inverter using a single current sensor in the DC link is presented, and a novel solution is proposed. The unique arrangement of the DC link allows full protection of the inverter from short circuits and overloads. Also, a new method of sampling the DC-link current is described that produces true values of the output currents at the centers of switching intervals. Results of investigation of an experimental setup have shown that full protection of the inverter has been accomplished and the output currents can accurately be determined within the whole operating area
Keywords :
AC motor drives; Hall effect devices; PWM invertors; electric current control; electric current measurement; electric sensing devices; protection; switching circuits; AC drives; DC link; Hall effect devices; PWM VSI; current sampling; current sensor technique; inverter protection; output currents; overload protection; short circuit protection; switching intervals; three-phase PWM-VS inverters; voltage source inverter; Circuit faults; Diodes; Earth; Industry Applications Society; Power cables; Power system protection; Pulse width modulation; Pulse width modulation inverters; Sampling methods; Voltage;
Journal_Title :
Industry Applications, IEEE Transactions on
